Method for producing a diaphragm for acoustic appliances

Abstract

In production of a diaphragm for acoustic appliances, a thin metal layer is formed on a substrate by means of vapor phase development so that the density of the product should be high enough for generating high sound pressure even in the high frequency range.

We claim: 
     
       1. An improved method for producing a diaphragm for acoustic appliances comprising the steps of developing a thin metal layer on a substrate by means of vapor phase development, and   increasing the density of said thin metal layer by exposing said layer to an elevated temperature and an elevated pressure.   
     
     
       2. An improved method as claimed in claim 1 wherein said increasing of the density of said thin metal layer is carried out on a hot press device. 
     
     
       3. An improved method as claimed in claim 1 wherein said increasing of the density of said thin metal layer is carried out on a hot hydrostatic device. 
     
     
       4. An improved method as claimed in claim 1 in which a material for said thin metal layer is chosen from a group consisting of beryllium, beryllium alloys, titanium and titanium alloys.   
     
     
       5. An improved method as claimed in claim 1 wherein said elevated temperature is between about 0.35 Tm and about Tm, Tm being the melting point of a material used for said thin metal layer. 
     
     
       6. An improved method as claimed in claim 1 wherein said elevated pressure is at least about 20 MPa. 
     
     
       7. A diaphragm for acoustic appliances produced by the method according to claim 1.